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Hydropower Plant

Tuen Mun Hydropower System

The hydropower system at Tuen Mun Water Treatment Works (WTW) is an important RE project for the Water Supplies Department (WSD) and it is the first of its kind in Hong Kong. Designed and implemented by the Water Supplies Department, this innovative and environmental-friendly renewable energy project is a pioneer in the world to construct 500kW hydropower facilities at a water treatment works.

Tuen Mun Water Treatment Works

Tuen Mun Water Treatment Works

Design of the Hydropower System

Basically, by making use of the hydraulic pressure and flow of raw water in the aqueducts, electrical power can be generated through a set of turbine generators. By means of power converters and step-up transformers, low voltage electricity generated by the WTGs will be converted into high voltage electricity of 11kV, which will then be connected to the electricity supply grid of the WTW to meet part of its power demand and hence reduce carbon emissions as well as the expenditure on electricity.

Design of the Hydropower System

Evaluation of the Effectiveness of Hydropower Generation

The hydropower project in Tuen Mun is carried out in two phases. The first phase and the second phase of the works have been completed successfully in May 2013 and February 2017 respectively. With the progressive growth of the water demand in the area, the output of the Tuen Mun WTW will be increased and we estimate that the hydropower system can generate up to about 3 million kWh of electricity annually in the future (equivalent to the potential reduction of about 2000 tonnes of carbon dioxide emissions each year from burning fossil fuels by the power company). It also enhances the stability and reliability of the operational facilities of the water treatment works.

Way Forward

Not only does the successful commissioning of the hydropower system in Tuen Mun signify our continual effort to employ renewable energy in waterworks installations, but also provides the industry with a useful instance of similar applications. With the valuable experience gained in this innovative project, we are going to use a similar hydropower system at the Sha Tin Water Treatment Works and the relevant works is expected to be completed by 2019. In addition, we will explore installation of hydropower system in other appropriate locations so as to continue to strive for a better living environment for Hong Kong.